Bobbins (Coil Formers), Mounts, Hardware

Part Number	Description / PDF	Quantity
B66372A2000T001 TDK EPCOS	BOBBIN COIL FORMER E 70X33X32	85
B65526A2000X000 TDK EPCOS	YOKE ER 11 X 5	0
B65702B0000T001 TDK EPCOS	BOBBIN COIL FORMER P 30 X 19	2448
B65820W1008D001 TDK EPCOS	BOBBIN COIL FORMER RM 7	151
B65936A0000T001 TDK EPCOS	BOBBIN COIL FORMER PS 9 X 3.5	2914
B64291A1804X000 TDK EPCOS	HOUSING HORIZONTAL TOROIDS	126
B65659F0003X023 TDK EPCOS	ADJUSTMENT SCREW RM 6	901
B65808N1006D001 TDK EPCOS	BOBBIN COIL FORMER RM 6	2997
B65808E1508T001 TDK EPCOS	BOBBIN COIL FORMER RM 6	1199
B65659F0004X023 TDK EPCOS	ADJUSTMENT SCREW RM 6	666
B64293A1100X000 TDK EPCOS	BASE PLATE TOROIDS	9
B65878E1012D001 TDK EPCOS	BOBBIN COIL FORMER PQ 26 X 25	519
B66208A2003X000 TDK EPCOS	YOKE E 25 X 13 X 7	149
B65714K1020T001 TDK EPCOS	BOBBIN COIL FORMER PM 87 X 70	8
B65942B0000T001 TDK EPCOS	BOBBIN COIL FORMER PS 30.5X10.2	935
B64292A1304X000 TDK EPCOS	HOUSING VERTICAL TOROIDS	397
B65685B1016T001 TDK EPCOS	BOBBIN COIL FORMER PM 62 X 49	73
B66206C1012T001 TDK EPCOS	BOBBIN COIL FORMER E 20 X 10 X 6	87
B66414W1008D001 TDK EPCOS	BOBBIN COIL FORMER EFD 15X8X5	618
B66206B1110T001 TDK EPCOS	BOBBIN COIL FORMER E 20 X 10 X 6	1196

Bobbins (Coil Formers), Mounts, Hardware

1. Overview

Bobbins (coil formers), mounts, and hardware are critical mechanical components in magnetic devices. Bobbins serve as structural supports for wound coils in transformers and inductors, while mounts/hardware ensure mechanical stability and electrical connectivity. These components enable precise winding alignment, thermal management, and electromagnetic interference (EMI) control, playing a vital role in power electronics, automotive systems, and industrial equipment.

2. Main Types and Functional Classification

Type	Functional Features	Application Examples
Transformer Bobbins	Provide winding support with insulation barriers	Switch-mode power supplies (SMPS), AC/DC converters
Inductor Coil Formers	Enable precise winding geometry for inductance control	DC/DC converters, EMI filters
PCB Mounts	Secure components to printed circuit boards	Telecom equipment, automotive ECUs
Core Clamps	Mechanical fixation for ferrite/powder cores	High-frequency transformers, PFC circuits

3. Structure and Composition

Typical bobbin structures include:

Central core with winding windows
Insulation barriers (e.g., UL-certified materials)
Termination options: PCB pins, wire terminals
Thermal vias for heat dissipation

Mounts/hardware feature:

Anti-vibration rubber
Corrosion-resistant platings (nickel, zinc)
Adjustable positioning brackets

4. Key Technical Specifications

Parameter	Importance
Temperature Resistance (130-200 C)	Determines thermal stability and lifespan
Dielectric Strength (>2kV)	Ensures safety isolation between windings
Dimensional Tolerance ( 0.05mm)	Impacts winding machine compatibility
Tensile Strength (>50MPa)	Prevents mechanical deformation under load
Surface Resistivity (10^12 )	Prevents leakage current paths

5. Application Fields

Power Electronics: 5G base station PSUs, solar inverters
Automotive: On-board chargers (OBC), 48V DC/DC converters
Industrial: CNC machine power supplies, motor drives
Consumer: Fast chargers, LED drivers

6. Leading Manufacturers

Manufacturer	Representative Products
TDK-Lambda	Compact PCB-mount bobbin series for telecom
Sumec Corporation	High-temp composite coil formers
Eaton Electronics	Vibration-resistant inductor mounts
Fastron IC	Customizable toroidal core hardware kits

7. Selection Guidelines

Key considerations:

Material compatibility with expected operating temperatures
Dimensional matching to core geometries (ETD, PQ, RM types)
Vibration resistance for automotive applications
RoHS compliance for environmental regulations
Cost optimization through standard vs. customized designs

Case Study: Electric vehicle chargers use high-temperature bobbins (UL 1557 recognized) to withstand 150 C continuous operation.

8. Industry Trends

Emerging developments include:

Miniaturization through liquid crystal polymer (LCP) materials
Integrated cooling channels in bobbin designs
Smart mounts with embedded temperature sensors
Increased adoption of 3D-printed custom hardware

Market drivers: Electrification of transportation, 5G infrastructure deployment, and energy-efficient appliance standards.